How to use this to deploy a github repository (Python) ?
That probably depends on the repository - what technologies are used. The best place to start looking for an answer would be here: https://docs.serv00.com/Python/ .
Now, for the second question, you'd probably have to check the terms of service at https://www.serv00.com/tos . In my interpretation of the 8th paragraph, you probably shouldn't use this server for computing. For Python computations, maybe you should check out Google Colab; it was made for it (don't know how fast it is, though).